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Her bottle blonde tresses were styled in plaits, one on either side of her head, ending in a low pony tail.

Blew in the face! The bottle blonde lit up as she sat on some steps, cell phone in hand, blowing smoke into the air

The beauty flashed her tummy when she changed into a green cropped hoodie and black jogging pants laced up at the sides as she left the shoot, carrying a denim jacket and a yellow long-sleeved T-shirt.

Sofia's bad habit is shared by her new boyfriend, Justin Bieber.

The 22-year-old hitmaker vowed to stop smoking as one of his New Year's resolutions but has struggled to do it.

Hard habit to break: The teen lit up as she relaxed on some stone steps where she was on her latest assignment

Glitter girl: Sofia dumped her shoes for comfy socks and pulled on shorts under her blingy sequin dress as she continued her break, blowing smoke into the air

The hot young couple were first linked last month when they were spotted holding hands in Hawaii.

And Justin joined Sofia for a romantic trip to celebrate her 18th birthday in Cabo San Lucas, Mexico.

Speaking about their romance in a interview with Billboard magazine, released on September 8, the rising star said: 'We have a special relationship. Justin is very easy to talk to, and that's hard to find with people in Los Angeles.'

Change of style: The celebrity looked far more comfortable in a green cropped hoodie and black jogging pants laced up at the sides as she left the shoot, carrying a denim jacket, a yellow long-sleeved sweatshirt and a large bag

Meanwhile, Sofia's modelling career is going from strength to strength.

She has already graced the pages of Elle, Vogue China and Vanity Fair Italy, and in 2015 she was the face of Madonna's teen line, Material Girl.

Nicole Richie's younger sister walked in Kanye West's New York Fashion Week show for Yeezy Season 4 on September 7.

Breaking his vow: Sofia's bad habit is shared by her new boyfriend, Justin Bieber. The 22-year-old vowed to stop smoking as one of his New Year's resolutions but has struggled to do it as this selfie from April shows